Shutter for projecting machines



Dec. 29, 1931. I B R H RDT 1,838,133

SHUTTER FOR PROJECTING MACHINES Filed Feb. 28, 1929 lllil'm Ll]l'l'TllIlllllIilildllll IN VEN TOR MZQ Patented Dec. 29, 1931 I I i EDSTATES oi-Flies J'AKOB BURKHARDT, 015 DETROIT, MICHIGAN, Ai SSIGNQB TOLFHIIRJJ DIMENSION PIC- TUBES, INC., 01 NEW YORK, N. Y., A"GORPORATIONOF "NEW YORK SHUTTER FOR moments humans Application filedFebruary 28, 1929. Serial No. 343:341. m

The main object of this invention is to pro- The sprocket 16-isadjustable on the shaft vide an improved shutter mechanism for pro- '18V jecting machines which has very rapid open- With the pai t'stheses-ranges, the shutters ing and closing action and which minimizesare drlven i-n synchro'nis'm "and at the same 5 flickering. speed but inopposite directions. They-are 3% Objects relating to details andeconomies of amngeds that their ed es overlap they my invention willappear from the descriprotat -see Fig.3, this bein'gtheclosed positionto follow. The invention is defined and tion. The opening andclosingisvery rapid pointed out in the claims. 1 anditis foundt'ominimizeflickeringor flut- A. structure which is a preferred emboditeringin-theprojected'pic'ture.

ment of my invention is illustrated in the ac- -I have especiallydesigned my improvecompanying drawings, in which: ment's foruse in theprojecting machine suc'h Fig. 1 is a front elevation of a projecting asis the subject matter-of my application for machine embodying thefeatures of my inven- Letters Patent, Serial N0533-13309, filed J anvtion, the parts other than the shutter being uary "9, 1929. *Myimprovements are, howshown in conventional form. evegvery desirable foruse in other relations. Fig. 2 is a fragmentary elevation looking I haven'otattempted-to illustrate or describe from the right of Fig. 1. thenumerous adaptatio'ns, however, as it 'is Fig. 3 is a fragmentary viewin section on believed that this disclosurewillenable those 7 line 3-3of Figs. 1 and 2. skilled'in theart to embody 'o'r adapt-my imnReferring to the drawings, 1 represents a 'provement'sas m'ay bedesired.

cabinet or housing of a projecting machine Having thus describedmyinv'erition,"what and 2 the lens thereof. These parts are claim as''n'e'wand desireto'secure by Letters shown in conventional form only.Patent, is: j

My improved shutter mechanism comprises '1. The combination in a"projecting 'maa supporting frame 3 carriedby the spaced chine, of alens, longitudinally slotted rods 4:, the rame being adjustably mountedspindlesdisposed"inupright' relationand union these rods so that theymay be moved to formlyspaced'relative to hevertioal central and from theWindow of the projecting maplane of the lens, coacting gears on said 7 3chine. spindles, a pair of "blade like shutters dis- "h The frame 3 isprovided with bearings 5 posed in said slots in said spindles, the

and 6 for the spindles 7 and 8, these spinspindles being disposedcentrally of the dies being vertically disposed in parallel reblades ndO tha edges of the-blades are lation and equally spaced relative to thevertig g 1I1t0 pp g Pelatlol} h Cal Central plane f the lens spindlesrevolve, and means for driving one The spindles are longitudinallyslotted to of 351d splndles;

receive the blade-like shutters 9, these shut- The combma'tfon proleqtmgters being secured in position by means of dune of a leps Spmdlesdlsposed Spaced the screws 10 paltrallelhrelatilonhand on opposite sidesof a The spindles are connected by the gears 11' p ane t mug t 6 centerof the lens and m a) a lane arallel to the face of the lens aid that h in at umfofm speeds and spihdles being longitudinally slotted, ion- PPdlrectlons' The spufdle 7 13 P necting gears on said spindles a pair ofblade- Vlded Wlth a beveled gear 12 at lts lower end like shuttersdisposed in said slots. the

e pg Wlth abeveled gear 13 on the sjhaft spindles being disposedcentrally of the 14,3118 Shaft ng Connected y the cha 1n 15 blades andso that the edges of the blades and the sprockets 16 nd 17 t0 h mgoverlap when in closed position, and means shaft 18 projecting from thehousing and suitfor driving one of said spindles.

ably connected to the film driving mechanism 3. The combinatlon in a.projecting mawithin the housing. chine, of a lens, spindles disposed inupright W0 relation and uniformly spaced relative to the verticalcentral plane of the lens and in a plane parallel to the plane of thelens, coacting gears 011 said spindles, a pair of bladelike shuttersmounted on said spindles so that the edges of the blades are broughtinto overlapping relation as the spindles revolve, and means for drivingsaid spindles in opposite directions at the same speed.

4. The combination in a projecting machine, of a lens, shutter spindlesdisposed in spaced parallel relation and on opposite sides of a planethrough the center of the lens and in a plane parallel to the face ofthe lens, blade-like shutters mounted on said spindles so that the edgesof the shutters are brought into overlapping relation as the spindlesrevolve, and coacting gears on said spindles whereby they are driven atuniform speeds in opposite directions.

The combination in a projecting machine, of a lens, a pair of blade-likeshutters mounted to rotate on parallel axes disposed in a plane parallelto the face of the lens and so that their edges are brought intooverlapping relation as they revolve, and means for driving saidshutters at the same speed and in opposite directions.

6. The combination in a projecting machine, of a lens, a pair ofshutters mounted to rotate on parallel axes uniformly spaced relative toa central plane of the lens and disposed in a plane parallel to the faceof the lens, and the means for driving said shutters at the same speedand in opposite directions.

7. The combination in a projecting machine, of a lens a pair of shuttersmounted to rotate on spaced parallel axes disposed in a plane parallelto the face of the lens and so that their edges are brought intooverlapping relation as they are rotated, and means for synchronouslydriving said shutters.

In Witness whereof I have hereunto set my hand.

JAKOB BURKHARDT.

